Use of S-(3-aminopropyl)thiosulfuric acid or metal salt thereof

• US 8,664,432 B2
• Filed: 06/01/2010
• Issued: 03/04/2014
• Est. Priority Date: 06/04/2009
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Ozturk, Orhan, Uekita, Yasuo, Takeuchi, Kenichi
• Primary Examiner(s): Puttlitz, Karl J
• Application Number:
  US13/375,859
• Publication Number:
  US 20120088928A1
• Time in Patent Office: 1,372 Days
• Field of Search: None
• US Class Current: 562/36
• CPC Class Codes: C08K 5/42 Sulfonic acids; Derivatives thereof
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers

Abstract

Use of S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof for improving the viscoelastic properties of a vulcanized rubber.

Claims

1. A method for improving the viscoelastic properties of a vulcanized rubber, comprising the steps of blending rubber with S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof, kneading the blend of rubber and S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof at 160°

C. to 200°

C., blending a sulfur component, kneading the blend of rubber, S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof and the sulfur component, and vulcanizing the kneaded blend of rubber, S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof, and the sulfur component.

2. The method according to claim 1, wherein the rubber is blended with a metal salt of the S-(3-aminopropyl)thiosulfuric acid.

3. The method according to claim 2, wherein a metal ion of the metal salt of the S-(3-aminopropyl)thiosulfuric acid is a lithium ion, a sodium ion, a potassium ion, a cesium ion, a cobalt ion, a copper ion or a zinc ion.

4. The method according to claim 3, wherein the metal ion is a lithium ion, a sodium ion or a potassium ion.

5. The method according to claim 2, wherein the metal salt of S-(3-aminopropyl)thiosulfuric acid is a 3-aminopropylthiosulfate represented by formula (2)

(H₂N—

(CH₂)₃—

SSO₃⁻

)_n.Mⁿ⁺ 

 

(2)

wherein Mⁿ⁺ represents a metal ion and n represents a valence thereof.

6. The method according to claim 5, wherein the metal ion is a lithium ion, a sodium ion, a potassium ion, a cesium ion, a cobalt ion, a copper ion or a zinc ion.

7. The method according to claim 6, wherein the metal ion is a lithium ion, a sodium ion or a potassium ion.

8. The method according to claim 1, wherein the rubber and S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof are blended with fillers prior to kneading.

9. The method according to claim 1, wherein the rubber and S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof are blended with zinc oxide prior to kneading.

10. The method according to claim 1, wherein the kneaded rubber and S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof are blended with a vulcanization accelerator prior to vulcanization.